Oscillating positive expiratory pressure device

ABSTRACT

An oscillating positive expiratory pressure device comprising a housing enclosing at least one chamber, a chamber inlet configured to receive exhaled air into the at least one chamber, and a chamber outlet configured to permit exhaled air to exit the at least one chamber. A channel is positioned in an exhalation flow path between the chamber inlet and the chamber outlet, with the channel being moveably connected to a chamber of the at least one chamber. An air flow regulator is moveable with respect to the channel between a first position, where the flow of air through the channel is restricted and a second position, where the flow of air through the channel is less restricted, the air flow regulator being configured to repeatedly move between the first position and the second position in response to a flow of exhaled air.

RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.14/946,409, filed on Nov. 19, 2015, pending, which is a continuation ofU.S. application Ser. No. 13/920,250, filed on Jun. 18, 2013, now U.S.Pat. No. 9,220,855, which is a continuation of Ser. No. 12/711,032,filed on Feb. 23, 2010, now U.S. Pat. No. 8,485,179, which claims thebenefit of U.S. Provisional Application No. 61/154,661, filed on Feb.23, 2009, and U.S. Provisional Application No. 61/181,200, filed on May26, 2009, all of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to an expiratory treatment device, and inparticular, to an oscillating positive expiratory pressure (“OPEP”)device.

BACKGROUND

Each day, humans may produce upwards of 30 milliliters of sputum, whichis a type of bronchial secretion. Normally, an effective cough issufficient to loosen secretions and clear them from the body's airways.However, for individuals suffering from more significant bronchialobstructions, such as collapsed airways, a single cough may beinsufficient to clear the obstructions.

OPEP therapy represents an effective bronchial hygiene technique for theremoval of bronchial secretions in the human body and is an importantaspect in the treatment and continuing care of patients with bronchialobstructions, such as those suffering from chronic obstructive lungdisease. It is believed that OPEP therapy, or the oscillation ofexhalation pressure at the mouth during exhalation, effectivelytransmits an oscillating back pressure to the lungs, thereby splittingopen obstructed airways and loosening the secretions contributing tobronchial obstructions.

OPEP therapy is an attractive form of treatment because it can be easilytaught to most hospitalized patients, and such patients can assumeresponsibility for the administration of OPEP therapy throughout theirhospitalization and also once they have returned home. To that end, anumber of portable OPEP devices have been developed.

BRIEF SUMMARY

In one aspect, an OPEP device comprises a housing enclosing at least onechamber, a chamber inlet configured to receive exhaled air into the atleast one chamber, and a chamber outlet configured to permit exhaled airto exit the at least one chamber. A channel positioned in an exhalationflow path between the chamber inlet and the chamber outlet is moveablyconnected to a chamber of the at least one chamber. Additionally, an airflow regulator is moveable with respect to the channel between a firstposition, where the flow of air through the channel is restricted and asecond position, where the flow of air through the channel is lessrestricted. The air flow regulator is configured to repeatedly movebetween the first position and the second position in response to a flowof exhaled air. A weight of the air flow regulator offers a resistanceto the flow of exhaled air through the channel during exhalation.

In another aspect, the channel is moveable about a center of rotation.The air flow regulator may comprise a center of mass offset from thecenter of rotation such that the channel is biased by the weight of theair flow regulator in the direction of gravity. Therefore, the channelmay be configured to move with respect to the housing in response to achange in an orientation of the housing.

In another aspect, the resistance to the flow of air through the channelmay be selectively adjustable independent of an orientation of thehousing. For instance, the channel may comprise a truncated cone that isrotatable about an axis offset from a central axis of the truncatedcone. The truncated cone may also be rotatable by a gear train extendingbeyond the housing.

In yet another aspect, the air flow regulator may have a sphericalshape.

In another aspect, the channel is moveably connected to the housing byat least one gimbal. The channel may be moveable about an axis ofrotation defined by a gimbal of the at least one gimbal. Furthermore,the gimbal may comprise a passage defining a portion of the exhalationflow path. Alternatively, the channel may be moveably connected to thehousing by a ball and socket joint.

In another aspect, the OPEP device may include a nebulizer port forreceiving an aerosol medicament into the at least one chamber. Thenebulizer port may also include a one-way valve configured to openduring inhalation and close during exhalation. An inhalation flow pathdefined between the nebulizer port and the chamber inlet may bypass thechannel.

In another aspect, the OPEP device may further include an indiciamoveable with the channel. At least a portion of the indicia is viewablefrom an exterior of the housing when the oscillating positive expiratorypressure device is in an orientation predetermined to be acceptable forthe administration of OPEP therapy. Also, the OPEP device may include aflexible annulus disposed between the housing and the channel configuredto expand in response to an increased pressure and form a seal betweenthe housing and the channel.

In another aspect, the at least one chamber may comprise a first chamberand a second chamber, where the second chamber is moveably connected tothe first chamber, and the channel is moveable with the second chamber.

In yet another aspect, an OPEP device includes a first chamber and asecond chamber, a chamber inlet configured to received exhaled air intothe first chamber, and a chamber outlet configured to permit exhaled airto exit the second chamber. A channel positioned in the second chamberin the exhalation flow path is moveably connected to the first chamber.An air flow regulator positioned in the channel is configured tooscillate in response to a flow of exhaled air between a first position,where the flow of air through the channels is restricted and a secondposition, where the flow of air through the channel is less restricted.A weight of the air flow regulator offers a resistance to the flow ofair through the channel during exhalation.

In another aspect, the second chamber may be configured to automaticallymove relative to the first chamber to maintain an orientation withrespect to gravity. For example, the second chamber may be moveablyconnected to the first chamber by a gimbal. As such, the channel may bemoveable about an axis of rotation defined by the gimbal. And, the airflow regulator may comprise a center of mass offset from the axis ofrotation. Thus, the channel may be biased by the weight of the air flowregulator in a direction of gravity. The gimbal may also comprise apassage between the first chamber and the second chamber that defines aportion of the exhalation flow path.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a first embodiment of an OPEP device;

FIG. 2 is a cross-sectional perspective view of the OPEP device of FIG.1;

FIG. 3 is a cross-sectional side view of a channel assembly of the OPEPdevice of FIG. 1, showing an air flow regulator in a first position inthe channel;

FIG. 4 is a cross-sectional side view of the channel assembly of theOPEP device of FIG. 1, showing the air flow regulator in a secondposition in the channel;

FIG. 5 is a cross-sectional side view of the channel assembly of theOPEP device of FIG. 1, showing one possible configuration for a portionof the channel;

FIG. 6 is a side view of the OPEP device of FIG. 1 connected to anebulizer for the combined administration of OPEP and aerosol therapies;

FIG. 7 is a cross-sectional side view of the OPEP device of FIG. 1connected to a nebulizer for the combined administration of OPEP andaerosol therapies;

FIG. 8 is a cross-sectional perspective view of a second embodiment ofan OPEP device;

FIG. 9 is a cross-sectional side view of a channel assembly of the OPEPdevice of FIG. 8;

FIG. 10 is a perspective view of a third embodiment of an OPEP device;

FIG. 11 is a cross-sectional perspective view of the OPEP device of FIG.10;

FIG. 12 is a different cross-sectional perspective view of the OPEPdevice of FIG. 10;

FIG. 13 is a cross-sectional side view of the OPEP device of FIG. 10,showing a channel maintaining alignment with a direction of gravity asan orientation of the OPEP device is rotated about a first axis;

FIG. 14 is a cross-sectional side view of the OPEP device of FIG. 10,showing the channel maintaining alignment with the direction of gravityas the orientation of the OPEP device is rotated about a second axis;

FIG. 15 is a cross-sectional side view of the OPEP device of FIG. 10,showing the channel maintaining alignment with the direction of gravityas the orientation of the OPEP device is rotated about both the firstaxis and the second axis;

FIG. 16 is a perspective view of a cup of the OPEP device of FIG. 10;

FIG. 17 is a cross-sectional side view of the OPEP device of FIG. 10,showing an upper portion of a housing in a locked position;

FIG. 18 is a cross-sectional front view of a channel assembly of theOPEP device of FIG. 10, showing the channel in one possible orientation;

FIG. 19 is a cross-sectional front view of the channel assembly of theOPEP device of FIG. 10, showing the channel in another possibleorientation;

FIG. 20 is a cross-sectional front view of the channel assembly of theOPEP device of FIG. 10, showing the channel in yet another possibleorientation;

FIG. 21 is a cross-sectional side view of the channel assembly of theOPEP device of FIG. 10, showing a seal between the housing and an outerring, the outer ring and an inner sphere, and the inner sphere and thecup;

FIG. 22 is a perspective view of a fourth embodiment of an OPEP device;

FIG. 23 is a perspective view of a channel assembly of the OPEP deviceof FIG. 22;

FIG. 24 is a cross-sectional perspective view of the OPEP device of FIG.22;

FIG. 25 is a different cross-sectional perspective view of the OPEPdevice of FIG. 22;

FIG. 26 is a perspective view of a fifth embodiment of an OPEP device;

FIG. 27 is a perspective view of a channel assembly of the OPEP deviceof FIG. 26, showing an indicia disposed on the channel assembly;

FIG. 28 is a cross-sectional front view of the OPEP device of FIG. 26,showing a flexible annulus configured to form a seal between a housingand a channel of the OPEP device;

FIG. 29 is a perspective view of a sixth embodiment of an OPEP device;

FIG. 30 is an exploded view of the OPEP device of FIG. 29;

FIGS. 31A-31D illustrates various views of a second housing suitable foruse in the OPEP device of FIG. 29;

FIG. 32 is a cross-sectional view of the OPEP device of FIG. 29;

FIG. 33 is a second cross-sectional view of the OPEP device of FIG. 29;

FIG. 34 shows a cross-sectional view of an alternative implementation ofthe OPEP device of FIG. 29;

FIG. 35 is a perspective view of a seventh embodiment of an OPEP device;

FIG. 36 is a cross-sectional view of the OPEP device of FIG. 35;

FIG. 37 is a cross-sectional view of a second chamber and of a chamberpassage of the OPEP device of FIG. 35;

FIG. 38 is a perspective view of an adjustment band of the OPEP deviceof FIG. 35;

FIGS. 39A-C are cross-sectional side views of the OPEP device of FIG.35, illustrating movement of the adjustment band of FIG. 38;

FIG. 40 is a perspective view of the OPEP device of FIG. 35 configuredwith a nebulizer port for the simultaneous administration of OPEP andaerosol therapies;

FIG. 41 is a side view of an orientation indicator connected to the OPEPdevice of FIG. 35.

FIGS. 42A-C are side views of the orientation indicator of FIG. 41,illustrating the visual feedback of the orientation indicator forvarious orientations of the OPEP device;

FIG. 43 is a perspective view of an eighth embodiment of an OPEP device;

FIG. 44 is a cross-sectional side view of the OPEP device of FIG. 43;

FIG. 45 is an exploded view of the OPEP device of FIG. 43,

FIG. 46 is a cross sectional side view of a channel of the OPEP deviceof FIG. 43;

FIG. 47 is a perspective view of a ninth embodiment of an OPEP device;

FIG. 48 is a cross-sectional side view of the OPEP device of FIG. 47;and,

FIG. 49 is an exploded cross-sectional side view of the componentshoused in the OPEP device of FIG. 47.

DETAILED DESCRIPTION

OPEP therapy is very effective within a range of operating conditions.For example, an adult human may have an exhalation flow rate rangingfrom 10 to 60 liters per minute, and may maintain a static exhalationpressure in the range of 10 to 20 cm H₂O. Within these parameters, OPEPtherapy is believed to be most effective when changes in the exhalationpressure range from 5 to 20 cm H₂O oscillating at a frequency of 10 to40 Hz. In contrast, an adolescent may have a much lower exhalation flowrate, and may maintain a lower static exhalation pressure, therebyaltering the operating conditions most effective for OPEP therapy.Likewise, the ideal operating conditions for an athlete may differ fromthose of an adult. As described below, the preferred embodiments areconfigurable so that ideal operating conditions may be selected andmaintained.

Referring to FIGS. 1-5, a first embodiment of an OPEP device 100 isshown. In general, the OPEP device 100 comprises a housing 102 having aninterior chamber 114, a chamber inlet 104, and a chamber outlet 106. Thehousing 102 may also be associated with a mouthpiece 108. Although themouthpiece 108 is shown as being fixedly attached to the housing 102, itis envisioned that the mouthpiece 108 may be removable and replaceablewith a mouthpiece 108 of a different size or shape. Alternatively, otheruser interfaces, such as breathing tubes or gas masks (not shown) may beassociated with the housing 102. Preferably, the housing 102 is openableso that the chamber 114 and the parts contained therein can beperiodically accessed, cleaned, replaced, or reconfigured. The housing102 may be constructed of any durable material, such as a polymer (e.g.,Acrylonitrile butadiene styrene).

In FIGS. 1-2, the housing 102 and the chamber 114 are generallyspherical in shape. However, a housing of any shape could be used.Furthermore, the chamber inlet 104 and the chamber outlet 106 could beany shape or series of shapes, such as a plurality of circular passagesor linear slots. More importantly, it should be appreciated that thecross-sectional area of the chamber inlet 104 is but one of the factorsinfluencing the ideal operating conditions described above. Althoughthese and other variables are generally described with reference to theembodiment of FIGS. 1-5, it should be understood that every embodimentdescribed herein may be varied in a similar manner.

Referring to FIG. 2, a cross-sectional view of the OPEP device 100 isshown. The OPEP device 100 further comprises a channel assembly 116mounted within the chamber 114. The channel assembly 116 generallyincludes a channel 118, an air flow regulator 120, and a rotation ball122. The channel assembly 116 provides an exhalation flow path from thechamber 114, through the channel 118, to the chamber outlet 106. Asexplained in greater detail below, the channel assembly 116 is moveablewith respect to the housing 102. The air flow regulator 120 is alsomoveably positioned within the channel 118, and is free to move aboutwithin the confines of at least a portion of the channel 118. The rangeof positions occupied by the air flow regulator 120 within the channel118 provides varying degrees of restriction on the flow of exhaled airthrough the channel 118.

As shown in FIG. 2, as well as the illustrations of other embodimentsdescribed herein, the spherical shape of the air flow regulator 120 isadapted to restrict the flow of air through the channel 118. However,other sizes or shapes, such as a conical air flow regulator, could besubstituted to achieve a different range of restriction. In general, theair flow regulators shown and described herein are spherical and have adiameter of five-eighths or eleven-sixteenths of an inch. Likewise, theweight of the air flow regulator 120 could be altered by changing thematerial of the air flow regulator 120. For instance, the air flowregulator 120 could be made from a plastic, aluminum, copper, brass, orsteel. Similarly, the shape of the channel 118 could be altered toachieve a different range of restriction. For example, a portion of thechannel 118 in FIG. 2 is shown as being conical, or having the shape ofa truncated cone; however, one or more portions of the channel 118 couldalternatively, or in combination, be spherical or cylindrical. In viewof these variables, it should be appreciated that an important factoraffecting the administration of OPEP therapy is the extent to which theair flow regulator 120 restricts the flow of air through the channel118. In this way, the OPEP device 100, as well as the other embodimentsdescribed herein, is highly configurable and can be altered according tothe prescribed OPEP therapy.

The OPEP device 100 shown in FIG. 2 may further include a nebulizer port110. The nebulizer port 110 is adapted for connecting a nebulizer (seeFIG. 5) to the OPEP device 100 for the simultaneous administration ofOPEP and aerosol therapies, as explained in more detail below. Thenebulizer port 110 may also include a one-way valve (not shown)configured to open on inhalation and close on exhalation. In thisconfiguration, an inhalation flow path is formed between the nebulizerport 110 and the chamber inlet 104 via the chamber 114, as indicated bya dashed line 112. If the OPEP device 100 is connected to a nebulizer,an aerosol medicament may be drawn from the nebulizer into therespiratory system of the user upon inhalation. If the OPEP device 100is not connected to a nebulizer, the user may inhale through thenebulizer port 110 the air surrounding the OPEP device 100, or air froma stand-alone air supply connected to the nebulizer port 110. However,in both cases, exhaled air is forced to traverse the channel 118 andexit the OPEP device 100 through the chamber outlet 106. Alternatively,the OPEP device 100 may include a separate inhalation valve (not shown)or omit the nebulizer port 110 altogether, in which case the user wouldhave to inhale through a source external to the OPEP device 100, such asthrough his or her nose. It should be appreciated that each embodimentdescribed herein may be adapted in a similar manner to provide thesimultaneous administration of OPEP and aerosol therapies.

In operation, the OPEP device 100 administers OPEP therapy to a userwhile he or she exhales into the chamber inlet 104. When the OPEP device100 is positioned in an upright orientation, as shown in FIG. 1, the airflow regulator 120 moves under the force of gravity into a firstposition, or a resting position, as shown in FIGS. 2-3. With the airflow regulator 120 in the first position, the flow of air through thechannel 118 is restricted, as indicated in FIG. 2 by a dotted line 111traversing a portion of the exhalation flow path. Depending on the shapeand size of the air flow regulator 120 and/or the channel 118, the airflow regulator 120 may restrict some or all of the exhaled air flowingthrough the channel 118. As the user continues to exhale, the pressurewithin the chamber 114 increases. As the pressure increases, the forceacting on the portion of the air flow regulator 120 restricting the flowof exhaled air through the channel 118 also increases. The force actingon the air flow regulator 120 continues to increase during exhalationuntil the force of gravity acting on the air flow regulator 120 isovercome, and the air flow regulator 120 moves from the first positionto a second position in the channel 118, as shown only by way of examplein FIG. 4.

In the second position, the air flow regulator 120 is lifted away fromthe resting position near the bottom of the channel 118. Depending onthe shape and size of the air flow regulator 120 and/or the channel 118,the air flow regulator 120 may roll, slide, or jump to the secondposition. With the air flow regulator 120 in the second position, theflow of air through the channel 118 is less restricted than the flow ofair through the channel 118 when the air flow regulator 120 is in thefirst position. As indicated by the dotted line 111 traversing a portionof the exhalation flow path, more air is permitted to traverse thechannel 118 and exit the chamber outlet 106. In this way, the weight ofthe air flow regulator 120 offers a resistance to the flow of exhaledair through the channel 118 during exhalation.

After the airflow regulator 120 moves to the second position, and theflow of air through the channel 118 increases, the pressure in thechamber 114 begins to drop. As the pressure decreases, the force actingon the portion of the air flow regulator 120 restricting the flow of airthrough the channel 118 also decreases. When this force drops below theforce of gravity acting on the air flow regulator 120, the air flowregulator 120 returns to the first position, thereby increasing therestriction on the flow of air through the channel 118, and causing thepressure in the chamber 114 to rise again. As a user continues toexhale, this process repeats itself, effectively generating anoscillating pressure in the chamber 114. This oscillating pressure is inturn transmitted back through the chamber inlet 104 and into therespiratory system of the user, providing him or her with OPEP therapy.

One advantage of the OPEP device 100 is its ability to reduce the effectof the orientation of the OPEP device 100 on the effectiveadministration of OPEP therapy. Returning to FIG. 3, a cross-sectionalside view of the channel assembly 116 is shown. As previously explained,the weight of the air flow regulator 120 offers a resistance to the flowof air through the channel 118. While the air flow regulator 120 is inthe first position, the force of gravity acting on the air flowregulator 120 is balanced by the force derived from the exhalationpressure in the chamber 114 and the normal force from the channel 118acting on the air flow regulator 120. Accordingly, if the orientation ofthe channel 118 were to change, the magnitude and direction of thenormal force from the channel 118 would change, as would the directionof the force acting on the air flow regulator 120 derived from theexhalation pressure in the chamber 114. The direction and magnitude ofgravitational forces acting on the air flow regulator 120, however,would remain unchanged. Put another way, a change in the orientation ofthe OPEP device 100 may increase or decrease the incline of the channel118 the air flow regulator 120 must traverse to arrive at the secondposition. Thus, the orientation of the channel 118, along with theposition of the air flow regulator 120 within the channel 118, couldprevent the air flow regulator 120 from sufficiently restricting theflow of air through the channel 118, such that the administration ofOPEP therapy would not be possible.

To that end, as shown in FIG. 2, the channel assembly 116 is moveablyconnected to the housing by a ball and socket joint. As such, thechannel assembly 116 is rotatable in any direction with respect to thehousing 102 about a center of rotation 128 located at the center of arotation ball 122. More specifically, the channel assembly 116 issupported within the chamber 114 by a pair of socket walls 124surrounding a portion of the rotation ball 122. The socket walls 124 areconically shaped and create a seal around the rotation ball 122. To aidin the creation of a seal around the rotation ball 122, yet maintainmobility of the channel assembly 116, the socket walls 124 and therotation ball 122 may be made of suitable low friction materials (e.g.,acetyl, nylon, etc.). Alternatively, a lubricant could be applied to therotation ball 122 and the socket walls 124. The socket walls 124 are inturn connected to a support plate 126 extending from the housing 102.Although the socket walls 124, the support plate 126, and the housing102 are shown as being connected via snap-fits, any other suitable meansof removable connection could be used.

Thus, as a user changes the orientation of the OPEP device 100, thechannel assembly 116 is free to rotate in any direction about the centerof rotation 128 and within the confines of the chamber 114. For example,and depending on the shape and size of the housing 102, as well as thelocation of the ball and socket joint contained therein, the channelassembly 116 may be able to rotate plus or minus ninety degrees in agiven direction before hitting the housing 102, the support plate 126,or a socket wall 124. However, the force of gravity acting on thechannel assembly 116, and in particular the air flow regulator 120,biases the channel assembly 116 in the direction of gravity.Accordingly, as the user changes the orientation of the OPEP device 100,the channel assembly 116 moves with respect to the housing 102 so thatit maintains alignment with the direction of gravity, and in anorientation that permits the administration of OPEP therapy. In thisway, the channel 118 maintains alignment with the direction of gravityso long as the user does not move the housing to an orientation beyondthe permissible range of movement of the channel assembly 118 (i.e.,plus or minus a specific number of degrees in a given direction).

The OPEP device 100 is further configurable in that the magnitude anddirection of the normal force from the channel 118 acting on the airflow regulator 120 is adjustable. As shown in FIGS. 2-5, a user may openthe housing 102 to access the chamber 114 and change the configurationof a portion of the channel 118 via a dial 130. The dial 130 is disposedabout an end of the channel assembly 116 and is connected to a truncatedcone 132. The axes of the dial 130 and the truncated cone 132 aremisaligned such that rotation of the dial 132 causes an asymmetricalrotation of the truncated cone 132. Put another way, a user may changethe incline of the channel 118 the air flow regulator 120 must traverseto arrive at the second position by rotating the dial 132. In this way,the user is able to adjust the magnitude and direction of the normalforce acting on the air flow regulator 120 such as, for example, from alower setting shown in FIGS. 3-4, to a higher setting shown in FIG. 5.In turn, the exhalation pressure required to move the air flow regulatorfrom the first position to the second position for the configuration inFIGS. 3-4 is greater than the pressure required in the configuration ofFIG. 5. Likewise, the frequency at which the air flow regulator 120moves between the first position and the second position is greater forthe configuration shown in FIGS. 3-4 than it is for the configurationshown in FIG. 5. By selecting various configurations of the truncatedcone 132, the user is able to further configure the OPEP device 100according to his or her prescribed OPEP therapy.

Referring to FIG. 6, a side view is shown of the OPEP device 100connected to a nebulizer 152 via the nebulizer port 110 for the combinedadministration of OPEP and aerosol therapies. Any of a number ofcommercially available nebulizers may be used with the OPEP device 100.One suitable nebulizer is the AeroEclipse® II breath actuated nebulizeravailable from Trudell Medical International of London, Canada.Descriptions of suitable nebulizers may be found in U.S. Pat. No.5,823,179, the entirety of which is hereby incorporated by referenceherein.

Turning to FIG. 7, a cross-sectional side view is shown of the OPEPdevice 100 and the nebulizer 152. The nebulizer 152 may be removablyconnected to the OPEP device 100 by any suitable means. As previouslyexplained, in this configuration, a user receives OPEP therapy uponexhalation, and aerosol therapy upon inhalation. As a user exhales, theone way valve (not shown) associated with the nebulizer port 110 closes,forcing exhaled air to exit the chamber 114 through the channel 118 andthe chamber outlet 106. In contrast, as a user inhales, the air flowregulator 120 restricts the flow of air through the channel 118, and theone way valve opens, permitting an aerosol medicament to be drawn fromthe nebulizer 152 through the chamber 114 and into the user.

One advantage of the embodiment of FIGS. 6-7 is that the inhalation flowpath from the nebulizer port 110 to the chamber inlet 102 bypasses thechannel 118, as indicated by the dashed line 112. As such, when the OPEPdevice 100 is connected to the nebulizer 152, aerosol medicament doesnot get stuck in the channel 118. In this manner, loss of medicament andcontamination of the channel 118 is may be reduced. Although theconfiguration in FIGS. 6-7 is shown in relation to the OPEP device 100,it should be appreciated that any of the embodiments disclosed hereincould be similarly adapted for the combined administration of OPEP andaerosol therapies.

Turning to FIG. 8, a cross-sectional perspective view of a secondembodiment of an OPEP device 200 is shown. In general, the OPEP device200 comprises the same components as the OPEP device 100. Morespecifically, the OPEP device 200 comprises a housing 202, a chamberinlet 204, a chamber outlet 206, a mouthpiece 208, a nebulizer port 210having a one way valve (not shown), a chamber 214, and a channelassembly 216. As with the OPEP device 100, the channel assembly 216 inthe OPEP device 200 is connected to the housing 202 by a ball and socketjoint, comprising a pair of socket walls 224 and a rotation ball 222.

Referring to FIGS. 8-9, the OPEP device 200 differs from the OPEP device100 in that a user does not have to open the housing 202 to adjust themagnitude and direction of the normal force from the channel 218 actingon the air flow regulator 220. Rather, the OPEP device 200 comprises agear train 234 that is connected to a truncated cone 232 and thatextends through the rotation ball 222 to a dial 230 accessible by theuser. As shown in FIG. 9, the gear train 234 is adapted to rotaterelative to the rotation ball 222 and defines a portion of theexhalation flow path leading from the chamber 214 to the chamber outlet206. Thus, a user can adjust the direction and magnitude of the normalforce acting on the air flow regulator 220 by rotating the dial 230,which in turn drives the gear train and changes the configuration of thetruncated cone 232. The OPEP device 200 is therefore configurable for aprescribed OPEP therapy in the same manner as the OPEP device 100. Inall other aspects, the OPEP device 200 administers OPEP therapy in thesame way as described above in relation to the OPEP device 100.

Turning to FIGS. 10-21, a third embodiment of an OPEP device 300 isshown. The OPEP device 300 comprises a housing 302, a chamber inlet 304,a chamber outlet 306, and a mouthpiece 308. Although the OPEP device 300is not shown as having a nebulizer port for connection to a nebulizer, anebulizer port could be included in the same manner as described abovein relation to the OPEP device 100.

Referring to FIG. 11, a cross-sectional view of the OPEP device 300 isshown. The OPEP device 300 includes a channel assembly 316 comprising anair flow regulator 320, a cup 336, an inner sphere 338, and an outerring 340. A channel 318 is defined within the cup 336 and the innersphere 338. As shown, the channel assembly 316 is moveably connected tothe housing 302 by a first gimbal 342 such that the channel assembly 316is rotatable about an axis defined between the first gimbal 342.Likewise, referring to FIG. 12, the inner sphere 338 is connected to theouter ring 340 by a second gimbal 344, offset ninety degrees from thefirst gimbal 342, such that the inner sphere 338 is rotatable about anaxis defined between the second gimbal 344. As such, the cup 336, theinner sphere 338, and the channel 318 are rotatable in any directionrelative to the housing 302 about a center of rotation 328. In thisembodiment, the center of rotation 328 is located at the intersection ofthe axes defined by the first gimbal 342 and the second gimbal 344. Asin the OPEP device 100 and the OPEP device 200, the weight of the airflow regulator 320 biases the channel assembly 318 in the direction ofgravity. Thus, as a user changes an orientation of the housing 302, thechannel assembly 316 moves relative to the housing 302 so that thechannel 318 maintains alignment with the direction of gravity, and in anorientation that permits the administration of OPEP therapy.

FIGS. 13-15 illustrate movement of the channel assembly 318 relative tothe housing 302 in response to a change in the orientation of the OPEPdevice 300. FIG. 13 is a cross sectional-side view of the OPEP device300, showing alignment of the channel assembly 318 with the direction ofgravity when the orientation of the OPEP device 300 is rotated about theaxis defined between the second gimbal 344 (see FIG. 12). In thisorientation, the cup 336 and the inner sphere 338 are rotated relativeto the housing 302 about the second gimbal 344, while the outer ring 340remains substantially unmoved. Similarly, FIG. 14 shows across-sectional side view of the OPEP device 300 in an orientation wherethe OPEP device 300 is rotated about the axis defined between the firstgimbal 342. In this orientation, the cup 336, the inner sphere 338, andthe outer ring 340 are all rotated relative to the housing 302 about theaxis defined between the first gimbal 342. Finally, FIG. 15 shows across-sectional side view of the OPEP device 300 in an orientation wherethe OPEP device 300 is rotated about both the axis defined between thesecond gimbal 344 and the first gimbal 342. In this orientation, the cup336 and the inner sphere 338 are rotated relative to the housing 302about the axis defined between the second gimbal 344, while the outerring 340 is rotated relative to the housing 302 about the axis definedbetween the first gimbal 342. In each instance, the channel assembly 318moves relative to the housing 302 in a direction opposite the change inorientation of the OPEP device 300, thereby maintaining alignment of thechannel assembly 318 with the direction of gravity and permitting theadministration of OPEP therapy.

During the administration of OPEP therapy, the cup 336 and the innersphere 338 are frictionally engaged such that they move in unison.However, the cup 336 is also selectively rotatable relative to the innersphere 338 to provide an adjustable normal force form the channel 318 onthe air flow regulator 320. Referring to FIG. 16, a perspective view ofa lower portion of the cup 336 is shown. The cup 336 of the OPEP device300 is openable so that the air flow regulator (not shown) may beaccessed for cleaning and replacement. As shown, the cup 336 isconfigured to have an asymmetrical surface 346. However, the cup 336could have any number of alternative configurations. The asymmetricalsurface 346, like the truncated cone in the OPEP device 100 and the OPEPdevice 200, is configured to supply a variable normal force on the airflow regulator 320, dependent on the orientation of the cup 336.

Returning to FIG. 12, a tab 348 connected to the cup 336 extends throughthe outer sphere 338 and the chamber outlet 306 to provide the user witha means of rotating the cup 336 relative to the inner sphere 338.Significantly, the tab 348 is aligned with the axis extending betweenthe second gimbal 344 so as to prevent the inner sphere 338 fromrotating relative to the outer ring 340 while the cup 336 is beingrotated. Even then, rotation of the cup 336 would cause the inner sphere338 and the outer ring 340 to rotate about the axis formed between thefirst gimbal 342. Accordingly, an upper portion 350 of the housing 302is configured to selectively move between an unlocked position, as shownin FIGS. 13-15, and a locked position, as shown in FIG. 17. In theunlocked position, the upper portion 350 is disengaged with the innersphere 338 such that the inner sphere 338 may rotate relative to thehousing 302. In the locked position, the upper portion 350 engages theinner sphere 338 and prevents its rotation. In this way, a user maypress down on the upper portion 350 to move the upper portion 350 fromthe unlocked position to the locked position, and then use the tab 348to rotate the cup 336 relative to the inner sphere 338. A means forbiasing (not shown) the upper portion 350 to the unlocked position maybe also be provided. Alternatively, the cup 336 and the inner sphere 338could be mechanically engaged so that they move in unison, but still bemoveable relative to one another, such as by means of a detent.

Referring to FIGS. 18-20, cross-sectional side views are shown of thecup 336 in different orientations within the channel assembly 316 of theOPEP device 300. In FIG. 18, the cup 336 is shown in an orientation suchthat the magnitude and direction of the normal force acting on the airflow regulator 320 require a larger exhalation pressure in the chamberto move the air flow regulator 320 from the first position to the secondposition. In other words, the air flow regulator 320 must traverse asteeper incline in the channel 318 to arrive at the second position.Similarly, the orientation of the cup 336 shown in FIG. 19 requires anintermediate exhalation pressure, and the orientation of the cup 336shown in FIG. 20 requires a smaller exhalation pressure. In this way, auser is able to selectively adjust the operating parameters of the OPEPdevice 300 by moving the upper portion 350 into the locked position andusing the tab 348 to change the orientation of the cup 336.

Turning to FIG. 21, a cross-sectional side view of the channel assembly316 of the OPEP device 300 is shown. In order for the OPEP device 300 toeffectively administer OPEP therapy, a seal must be formed between thehousing 302 and the outer ring 340, the outer ring 340 and the innersphere 338, and the inner sphere 338 and the cup 336. For the interfacesbetween the housing 302 and the outer ring 340, as well as between theouter ring 340 and the inner sphere 338 (i.e., components that are freeto move under the weight of the air flow regulator 320), a seals iscreated between appropriately sized cylindrical and spherical surfaces.For the interface between the inner sphere 338 and the cup 336 (i.e.,parts that are not free to move under the weight of the air flowregulator 320), a seal is created between appropriately sized sphericalsurfaces, which also provides friction sufficient to permit the innersphere 338 and the cup 336 to move in unison. As such, exhaled air isforced through the channel 318 during the administration of OPEPtherapy. In all other aspects, the OPEP device 300 administers OPEPtherapy in the same way as described above in relation to the OPEPdevice 100.

It should be appreciated that the seal formed between the housing 302and the outer ring 340 is maintainable for a specific range of movement,the limits of which are defined by the shape and size of the housing 302and the outer ring 340. For instance, a significant change in theorientation of the OPEP device 300 may cause the outer ring 340 torotate relative to the housing 302 about the first gimbal 342 to aposition where the cylindrical surface of the housing 302 and thespherical surface of the outer ring 340 are no longer in a sealingengagement.

Referring to FIGS. 22-25, a fourth embodiment of an OPEP device 400 isshown. In general, the OPEP device 400 comprises a cylindrical housing402, a chamber inlet 404, a chamber outlet 406, and a mouthpiece 408. Asshown in FIG. 23, the OPEP device 400 further comprises a channelassembly 416 that includes an inner sphere 438. The channel assembly 416is cylindrically shaped and sized so that the housing 402 circumscribesthe channel assembly 416 in a manner allowing the channel assembly 416to rotate with respect to the housing 402. In this way, the channelassembly 416 and the inner sphere 438 are rotatable with respect to thehousing 402 about an axis of rotation defined by a central axis of thehousing 402 and the channel assembly 416. As previously explained,suitable low friction materials or a lubricant may be to aid therelative movement of the housing 402 and the channel assembly 416.

Turning to FIG. 24, a cross-sectional perspective view of the OPEPdevice 400 is shown. The channel assembly 416 of the OPEP device 400further comprises a channel 418, an air flow regulator 420, a cup 436,and an inner sphere 438. The inner sphere 438 is connected to thechannel assembly 416 by a gimbal 442 such that the inner sphere 438 isrotatable relative to the channel assembly 416 about an axis definedbetween the gimbal 442. As such, the inner sphere 438 and the channel418 are rotatable in any direction with respect to the housing 402 abouta center of rotation 428. In this embodiment, the center of rotation 428is located at the intersection of the central axis of the housing 402and the axis defined between the gimbal 442. Moreover, like thepreviously described OPEP devices, the weight of the air flow regulator420 biases the channel 418 in the direction of gravity. Thus, as a userchanges an orientation of the housing 402, the channel 418 movesrelative to the housing 402 under the weight of the air flow regulator420 such that the channel 418 maintains alignment with the direction ofgravity, and in an orientation that permits the administration of OPEPtherapy.

Turning to FIG. 25, a different cross-sectional view of the OPEP device400 is shown. The OPEP device 400 and the channel assembly 416 areconfigured to force exhaled air to pass through the channel 418 and outthe chamber outlet 406 during the administration of OPEP therapy.However, because the OPEP device 400 shown in FIG. 18 does not include anebulizer port, a user would have to inhale through a source external tothe OPEP device 400, such as through his or her nose. Alternatively, theOPEP device 400 could include a separate inhalation valve to facilitateinhalation through the OPEP device 400. In all other aspects, the OPEPdevice 400 administers OPEP therapy in the same way as described abovein relation to the OPEP device 100.

Referring to FIGS. 26-28, a fifth embodiment of an OPEP device 500 isshown. In general, the OPEP device 500 comprises a housing 502, achamber inlet 504, a chamber outlet (not shown), and a mouthpiece 508.The OPEP device 500 further includes a window 554 for viewing a positionof the channel assembly 516 (FIG. 26) relative to the housing 502.Although the window 554 may comprise a plate of transparent plastic orglass, the window could alternatively comprise an opening in the housing502 and serve as the chamber outlet. Similar to the OPEP device 300, thechannel assembly 516 is moveable relative to the housing 502 via anouter ring connected to the housing 502 by a first gimbal 542, which asshown in FIG. 26, are partially viewable from the exterior of thehousing 502.

Turning to FIG. 27, a perspective view of the channel assembly 516 ofthe OPEP device 500 is shown. The channel assembly 516 also includes anouter ring 540 (FIG. 23) which has been omitted in FIG. 27 for purposesof illustration. An inner sphere 538 is connected to the outer ring 540by a second gimbal 544 such that the inner sphere is rotatable relativeto the outer ring 540 about an axis defined between the second gimbal544. Furthermore, as previously explained, the outer ring 540 isrotatable relative to the housing 502 about an axis defined between thefirst gimbal 542. The inner sphere 538 is therefore rotatable in anydirection relative to the housing 502 about a center of rotation (notshown) located at the intersection of the axes defined between the firstgimbal 542 and the second gimbal 544.

Also shown in FIG. 27, an indicia 556 is disposed on the channelassembly 516 to provide the user with visual feedback regarding theposition of the channel assembly 516 within the housing 502. Morespecifically, the indicia 556 is disposed on the inner sphere 538 sothat it moves with a channel (FIG. 28) of the OPEP device 500. Theindicia is positioned on the channel assembly 516 in a location relativeto the window 554 such that, as long as the user can view at least aportion of the indicia 556 through the window 554, the OPEP device 500is in an orientation conducive to providing the prescribed OPEP therapy.Although the indicia 556 is shown as being a rectangular strip, theindicia 556 could be any number of shapes or sizes, depending on variousfactors influencing the operating parameters, including the shape andsize of the air flow regulator and/or the channel 518.

Turning to FIG. 28, a cross sectional front view of the OPEP device 500is shown. Like the OPEP device 300, a seal in the OPEP device 500between the channel assembly 516 and the housing 501 helps toeffectively provide OPEP therapy. As such, the OPEP device 500 includesa flexible annulus 556 connected to the outer ring 540 and disposedbetween the housing 502 and the channel assembly 516. The flexibleannulus 556 is adapted to expand and form a seal between the housing 502and the channel assembly 516 in response to an increased pressuregenerated as a user exhales into the OPEP device 500. In all otheraspects, the OPEP device 500 administers OPEP therapy in the same way asdescribed above in relation to the OPEP device 100.

With respect to the embodiment of FIGS. 26-28, it should be appreciatedthat the range of movement conducive to the administration of OPEPtherapy may be limited by the configuration of the housing 502 and/orthe location of the chamber outlet. More specifically, theadministration of OPEP therapy becomes impossible if the outer ring 540rotates relative to the housing 502 such that the flexible annulus 556moves past the chamber outlet, forming an exhalation flow path directlybetween the chamber inlet and the chamber outlet, i.e., an exhalationflow path that bypasses the channel assembly 516. Furthermore, exhaledair must traverse the channel assembly 516 and exit the chamber in thesame manner as in the previously described embodiments; exhaled air maynot flow through the channel assembly 516 in reverse order. Accordingly,the indicia 556 may alternatively be positioned to indicate to the userthe total range of orientations permissible for the administration ofOPEP therapy.

Referring now to FIGS. 29-34, another embodiment of an OPEP device 600is illustrated. As shown in FIGS. 29-30, the OPEP device 600 includes afirst chamber 602 having a mouthpiece 604 defining a chamber inlet 606for receiving exhaled air, and a second chamber 608 pivotably connectedto the first chamber 602 and having a chamber outlet 610. The firstchamber 602 is y-shaped and defines a hollow passageway starting at thechamber inlet 606 that splits into two hollow arms 612 that open up intoopposing openings 614 on the inside of each of the arms 612. Referringto FIG. 30, a chamber passage 616 extending from each side of the secondchamber 608 pivotally connects to the openings 614 in the first chamber602 using inner and outer bushings 618, 620. Each inner bushing 618 maybe press fit onto a respective chamber passage 616 of the second chamber608 and each outer bushing 620 may be press fit into a respectiveopening 614 in the first chamber 602. The inner bushing 618 may includean outer surface 622 and a flange 624, where the outer surface 622 issized to slidably and sealingly fit against the inner surface 626 of theouter bushing 620. The inner and outer bushings 618, 620 may form afixed seal against the chamber passage 616 and the opening 614,respectively, while the surface between a pair of inner and outerbushings 618, 620 maintains a rotatable seal to permit the secondchamber 608 to rotate about the axis defined by the chamber passages 616with respect to the first chamber 602. In this way, the chamber passages616, along with the inner and outer bushings 618, 620, function as agimbal in the same manner as described in relation to other embodiments.An air flow regulator 628, such as the sphere illustrated in FIG. 30, ismoveably positioned in the second chamber 608 as described in greaterdetail below.

FIGS. 31A-31D show various views of the second chamber 608. The chamberpassages 616 are positioned on opposite sides of the second chamber 608and provide a means for exhaled air to pass from the first chamber 602into an outer volume 630 defined between an outer wall 632 and an innerwall 634 of the second chamber 608. The outer volume 630 connects with achannel 636 via an opening 638 defined by the inner wall 634. The outerand inner walls 632, 634, or portions thereof, may have a tapered orroughly conical shape. The overall length of the second chamber 608 maybe designed so that the ends of the second chamber 608 clear the base ofthe y-shaped first chamber 602 such that the second chamber 608 mayrotate 360 degrees between the arms 612 of the first chamber 602 aboutthe axis defined by the chamber passages 616. The opening 638 to thechannel 636 is sized to cooperate with the air flow regulator 628 asdescribed in greater detail below to create an OPEP. Additionally, thechannel 636 may be tapered to bias the air flow regulator 628 toward theopening 638 and automatically maintain an orientation of the secondchamber 608 based on the weight of the air flow regulator 628 positionedat the bottom of the channel 636.

As shown in FIGS. 32-33, the first chamber 602 defines a first part ofthe exhalation flow path 601 that directs air exhaled into the chamberinlet 606 through each of the two arms 612 that are formed in the distalend of the first chamber 602. The exhalation flow path 601 continuesthrough the openings 614 in the first chamber 602, the inner and outerbushings, 618, 620 and the chamber passages 616 of the second chamber608. As best shown in FIG. 33, exhaled air then enters the outer volume630 defined by the an outer wall 632 and an inner wall 634 of the secondchamber 608.

The outer and inner walls 632, 634 are sealed together at the top endwith a continuous wall so that the only exit for air entering the outervolume 630 via the chamber passages 616 is through an opening 638 to thechannel 636 and the chamber outlet 610. The general principles ofoperation for the air flow regulator 628 are the same as in the OPEPembodiments described above. The air flow regulator 628, in a first orresting position as shown in FIG. 33, restricts access of exhaled air tothe chamber outlet 610. Depending on the shape and size of the air flowregulator 628 and/or the opening 638, the air flow regulator 628 mayrestrict some or all of the exhaled air flowing through the opening 638.As the user continues to exhale, the pressure within the outer volume630 increases. As the pressure increases, the force acting on theportion of the air flow regulator 628 restricting the flow of exhaledair through the opening 638 also increases. The force acting on the airflow regulator 628 continues to increase during exhalation until theforce of gravity acting on the air flow regulator 628 is overcome, andthe air flow regulator 628 moves away from the opening 638 to a secondposition in the channel 636.

The air flow regulator 628 may roll, slide, or jump to the secondposition depending on the combination of weight, shapes and sizes of theair flow regulator 628 and the opening 638. As shown, the air flowregulator 628 comprises a sphere having a certain relative size to theopening 638, however any of a number of shapes, sizes and materials canbe used for these elements to achieve a desired response and form ofmovement. When the pressure of exhaled air overcomes the weight of theair flow regulator 628, the air flow regulator 628 moves to a secondposition that allows at least a portion of exhaled air (or an increasedportion) through the opening 638 and out of the OPEP device 600 via thechamber outlet 610. As a result of the airflow regulator 628 beingdisplaced to the second position and air flow increasing, the pressurein the outer volume 630 begins to drop until the force of gravity actingon the air flow regulator 628 overcomes the force of the exhaled air andthe air flow regulator 628 returns to the first position. As describedpreviously, this process repeats itself multiple times so that the airflow regulator 628 may oscillate multiple times during each exhalationand transmit an oscillating pressure back through the device 600 to theuser exhaling at the mouthpiece 604.

As with previous embodiments discussed above, the OPEP 600 of FIGS.29-33 is configured to reduce the effect of the orientation of the OPEPdevice on the amplitude and oscillation frequency of OPEP therapyprovided. The weight of the air flow regulator 628 not only helps to setthe oscillation frequency and amplitude, but also assists in maintainingthe orientation of the channel 636, and consequently, the second chamber608. For example, the weight of the air flow regulator 628, incooperation with the chamber passages 616 and the inner and outerbushings 618, 620 between the first and second chambers 602, 608, actsto automatically maintain the orientation of the longitudinal axis ofthe second chamber 608 in a position generally parallel with thedirection of gravity so that the tapered portion of the channel 636points in the direction of gravity regardless of the angle of the firstchamber 602 with respect to the second chamber 608. In the embodimentshown, the second chamber 608 may freely pivot 360 degrees about theaxis defined between the chamber passages 616. In other embodiments, theamount of available rotation may be restricted to be less than 360degrees.

In alternative implementations of the embodiment of FIGS. 29-33, theOPEP device 600 may include an nebulizer port (not shown) with a one-wayinhalation valve that remains sealed during exhalation through thechamber inlet 606 and opens to allow air into the OPEP duringinhalation. The inhalation port may be located anywhere on the firstchamber 602 or the second chamber 608. The one way valve may be any of anumber of known valve types and materials, for example a simple flap offlexible material or a duck-bill valve. Also, if one or more of theopenings 614 in the first chamber 602 and chamber passages 616 in thesecond chamber 608 are fabricated from a slippery material, the innerand outer bushings 618, 620 may be omitted and a pivotable, sealed jointachieved.

Also, as shown in FIG. 34, a fixed or removable air flow regulatorretaining member 642 may be located in or on the second chamber 608 toprevent the air flow regulator 628 from being inadvertently removed fromthe channel 636. The retaining member 642 may be mounted inside thechannel 636, for example in the form of one or more protrusions as shownthat allow the air flow regulator 628 to move within the channel 636,but prevent it from escaping, or may be a grill or other suitablerestraining mechanism fixedly or removably attached to the secondchamber 628 over the chamber outlet 610 that lets air escape butprevents the air flow regulator 628 from escaping.

Referring now to FIGS. 35-42, a seventh embodiment of an OPEP device 700is shown. In general, the OPEP device 700 includes a housing 702enclosing an chamber 714, a chamber inlet 704, a chamber outlet 706, anda mouthpiece 708. As with previous embodiments, an exhalation flow path,identified by dotted line 711, is defined between the chamber inlet 704and the chamber outlet 706. The OPEP device 700 also includes anorientation indicator 758 to provide a user with visual feedback of theorientations of the OPEP device 700 suitable for providing OPEP therapy,as explained in greater detail below. In addition, a transparent window760 may be included with the housing 702 to permit the user to view thecomponents contained therein, such as those that may be adjustableand/or selectively replaced to obtain the desired operating conditions.Like the previous embodiments, it is preferable that the OPEP device 702is openable, so that the components contained therein are accessible forcleaning, replacement, and/or selective adjustment.

Referring to FIG. 36, a cross-sectional view of the OPEP device 700shows the components housed in the OPEP device 700. As show in FIGS.36-38, those components include a channel assembly 716, an adjustmentband 763, and inner and outer bushings 762, 764, which may operate toseal the chamber 714 and permit the channel assembly 716 to moverelative to the chamber 714. As with previous embodiments, the OPEPdevice 700 also includes an air flow regulator 720 that rests in achannel 718 in the channel assembly 716.

Turning to FIG. 37, a cross-sectional view of the channel assembly 716is shown. In addition to the channel 718, the channel assembly 716comprises a pair of cylindrical supports surfaces 766 about which thechannel assembly 716 may be supported by the inner and outer bushings762, 764 and pivotably attached to the housing 702. In this way, thecylindrical support surfaces act as a gimbal. Furthermore, one of thecylindrical support surfaces 766 forms a passage 768 defining a portionof the exhalation flow path. As shown in FIG. 37, and as previouslydescribed in relation to other embodiments, the channel 718 may comprisea truncated cone, the orientation of which may affect the amplitude andfrequency of the administered OPEP therapy. Finally, the channelassembly 716 may include an annular surface 770 about which theadjustment band 763 may be mounted.

Turning to FIG. 38, the adjustment band 763 of the OPEP device 700 isshown. In general, the adjustment band 763 is shaped and sized to fitaround the annual surface 770 of the channel assembly 716 such that theadjustment band 763 and the channel assembly 716 are frictionallyengaged with one another, but may be rotated relative to one anotherunder minimal force applied by the user. The adjustment band 763 alsoincludes a secondary weight 772, a retaining member 774 to keep the airflow regulator 720 within the channel 718, and an indicia 776 to showthe position of the channel assembly 716 relative to the adjustment band763. Notably, when the adjustment band 763 is mounted to the channelassembly 716, the position of the secondary weight creates a center ofmass offset from the axis about which the channel assembly 716 rotatesrelative to the housing 702.

Like the previously described embodiments, the OPEP device 700 isadapted to provide OPEP therapy in a variety of orientations. Morespecifically, as the housing 702 is rotated about the axis definedbetween the cylindrical support surfaces 766, gravity acting on thesecondary weight 772 in the adjustment band 763 causes the channelassembly 716, and thus the channel 718, to rotate relative to thehousing 702 to a position where the secondary weight 772 is below theaxis between the cylindrical support surfaces 766. In this way, theorientation of the channel assembly 716 will not substantially change asthe orientation of the housing 702 is rotated about the axis definedbetween the cylindrical support surfaces 766. To the extent theorientation of the housing 702 is rotated about the axis perpendicularto the axis defined between the cylindrical support surfaces 766, theorientation indicator 758 provides the user with visual feedback ofacceptable orientations for the administration of OPEP therapy, asexplained below.

The OPEP device 700 operates in a manner similar to that of thepreviously described embodiments. As a user exhales into the mouthpiece708, the exhaled air is forced along the exhalation flow path defined bythe dotted line 711. More specifically, the exhaled air is directedthrough the passage 768 extending into the channel assembly 716.However, the air flow regulator 720, in a first or resting position asshown in FIG. 36, restricts access of exhaled air to the chamber outlet706. Depending on the shape and size of the air flow regulator 720, theair flow regulator 720 may restrict some or all of the exhaled airflowing through the channel 718. As the user continues to exhale, thepressure behind the air flow regulator 720 increases, and the forceacting on the portion of the air flow regulator 720 restricting the flowof exhaled air through the channel 718 also increases. The force actingon the air flow regulator 720 continues to increase during exhalationuntil the force of gravity acting on the air flow regulator 720 isovercome, and the air flow regulator 720 moves away from its restingposition to a second position in the channel 718.

In turn, the increased volume of exhaled air flowing through the channel718 while the air flow regulator 720 is in the second position resultsin a decrease in pressure behind the air flow regulator 720. As thepressure decreases, the force acting on the portion of the air flowregulator 720 restricting the flow of air through the channel 718 alsodecreases until the air flow regulator 720 moves back to the firstposition under the force of gravity. As this process repeats itself,OPEP therapy is delivered to the user.

The OPEP device 700, like the previously described embodiments, is alsoselectively adjustable to obtain the desired operating conditions of theOPEP therapy. As previously explained, the oscillation frequency and theamplitude of the OPEP therapy is dependent upon, amongst othervariables, the angle of the channel 718 that contacts the air flowregulator 720, the normal force supplied by the channel 718 against theair flow regulator 720, and the direction of gravity relative thereto.

As shown in FIG. 36, the adjustment band 763 and the channel assembly716 may be frictionally engaged with one another about the annularsurface 770 of the channel assembly 716 such that both the channelassembly 716 and the adjustment band 763 are supported by the inner andouter bushings 762, 764 and pivotably attached to the housing 702.Referring to FIGS. 39A-C, an illustration is provided showing theselective rotation of the adjustment band 763 relative to the channelassembly 716. A user may accomplish such an adjustment by opening thehousing to access the components contained therein, or by any othersuitable means.

In FIG. 39A, the channel assembly 716 is shown in one possibleorientation relative to the adjustment band 763. Notably, the secondaryweight 772 is located below the axis defined between the supportsurfaces 766 (not shown), as the force of gravity biases the adjustmentband 763 and secondary weight 772 to this location. To adjust thefrequency and amplitude of the OPEP therapy provided by the OPEP device700, a user may overcome the frictional engagement between theadjustment band 763 and the channel assembly 716 to rotate theadjustment band 763 relative to the channel assembly 716, as shown inFIG. 39B. Then, as shown in FIG. 39C, once the adjustment band 763 isreleased and the frictional engagement re-established, the adjustmentband 763, and thus the channel assembly 716, will rotate under the forceof gravity back to a position where the secondary weight 772 is locatedunder the axis defined between the support surfaces 766. By adjustingthe orientation of the channel assembly 716 relative to the adjustmentband 763 shown in FIG. 39A to the orientation shown in FIG. 39C, theangle of the channel 718 that contacts the air flow regulator 720, thenormal force supplied by the channel 718, and the direction of gravityrelative thereto will also have changed. As shown in FIG. 35, suchorientations may be viewed by the user through the transparent window760 included with the housing 702. Furthermore, predeterminedorientations may be selected by the user according to the indicia 776located on the adjustment band 763.

Referring now to FIG. 40, the OPEP device 700 may also be adapted toprovide simultaneous administration of OPEP and aerosol therapies. Asshown, the OPEP device 700 may include a nebulizer port 710 connectableto any number of commercially available nebulizers, such as the oneidentified above. As described in relation to other embodiments, thenebulizer port 710 may include a one-way valve that remains closed as auser exhales and receives OPEP therapy, but opens upon inhalation toprovide the user with aerosol therapy. Notably, and as in the previouslydescribed embodiments, the inhalation flow path from the nebulizer port710 to the mouthpiece 708 bypasses the channel 718, thereby reducing thepotential for loss of expensive medicament.

As illustrated by the various embodiments of the OPEP devices describedabove, certain OPEP or other respiratory devices may include anorientation indicator to provide a user with visual feedback of theideal and/or suitable orientation of the OPEP device for theadministration of OPEP therapy. By way of example, FIG. 41 shows aportion of the OPEP device 700 with an orientation indicator 758attached to the housing 702 in a location relative to the mouthpiece 708such that, as the user exhales into the mouthpiece 708, the user is ableview the orientation indicator 758 to determine whether the orientationof the OPEP device 700 is suitable and/or ideal for the administrationof OPEP therapy.

In general, the orientation indicator 758 includes a capsule 778enclosing an indicator 780. The indicator 780 may be comprised of anysuitable material, such as a plastic, and may be spherically shaped. Thecapsule 778 may be shaped, for example, like a pair of cones whose basesare coplanar. Furthermore, the capsule 778 may be connected to the OPEPdevice 700 such that movement of the OPEP device 700 within apredetermined range of orientations causes the indicator 780 to move toa portion of the capsule 778 near the coplanar bases, thus indicating asuitable and/or ideal orientation of the OPEP device 700 for theadministration of OPEP therapy. Likewise, the capsule 778 may be shapedand connected to the OPEP device 758 such that movement of the OPEPdevice 758 within a separate predetermined range of orientations causesthe indicator 780 to move to a portion of the capsule 778 near eithertip of one of the pair of cones, thereby indicating an orientation ofthe OPEP device 700 not suitable or ideal for the administration of OPEPtherapy. As a further aid to the user, the orientation indicator 758 mayinclude a form of demarcation identifying the portion of the capsule 778in which the presence of the indicator 780 indicates an orientation ofthe OPEP device 700 suitable and/or ideal for the administration of OPEPtherapy. In FIG. 41, for example, the demarcation is a non-transparentmaterial surrounding the capsule 778.

An illustration of the visual feedback provided by the orientationindicator 758 is shown in FIGS. 42A-C. As seen in FIGS. 42A and 42C,when the OPEP device 700 is rotated about the axis perpendicular to thesupport surfaces (not shown) described above to an orientation notsuitable for or ideal to the administration of OPEP therapy, theindicator 780 moves away from the center of the capsule 778 and behindthe non-transparent material surrounding the capsule 778. In contrast,while the OPEP device 700 is maintained in an orientation suitableand/or ideal for the administration of OPEP therapy, the indicator 780remains in the center portion of the capsule 778, as shown in FIG. 42B.In this way, the orientation indicator 758 provides the user with visualfeedback of orientations of the OPEP device 700 suitable and/or idealfor the administration of OPEP therapy.

Referring now to FIGS. 43-46, an eighth embodiment of an OPEP device 800is shown. In general, the OPEP device 800 includes a housing 802enclosing a chamber 814, a chamber inlet 804, a chamber outlet 806, anda mouthpiece 808. As in prior embodiments, an exhalation flow path,identified by dotted line 811, is defined between the chamber inlet 804and the chamber outlet 806. The OPEP device 800 also comprises an airflow regulator 820 maintained within a channel 818 extending into thechamber 814.

Turning to FIGS. 45-46, the channel 818 of the OPEP device 800 iscylindrically shaped and sized so as to fit within and frictionallyengage a corresponding cylindrical portion of the housing 802, therebyforming a seal. As shown and described in relation to prior embodiments,a portion 819 of the channel 818 may comprise a truncated cone. Thechannel 818 may also include a fixed or removable air flow regulatorretaining member (not shown) disposed within the channel 818 so as tokeep the air flow regulator 820 within the confines of the channel 818.

The OPEP device 800 operates substantially the same as described abovein relation to other embodiments, except that its operation is partiallydependent upon the orientation of the OPEP device 800. To that end, theOPEP device 800 may include one or more suitable orientation indicators,such as those described above.

When held in a substantially upright position, as shown in FIG. 43, theair flow regulator will move under the force of gravity to a restingposition in the base of the truncated cone, as shown in FIG. 44. As auser exhales into the mouthpiece 808 through the chamber inlet 804, theair flow regulator 820 restricts the flow of air through the channel 818flowing to the chamber outlet 806, causing the pressure in the chamber814 to increase. The pressure in the chamber 814 continues to increaseuntil the force acting on the portion of the air flow regulator 820restricting the flow of air through the channel 818 overcomes the forceof gravity acting on the air flow regulator 820, thereby causing it tomove away from its resting position to a second position in the channel818. In the second position, the air flow regulator 820 restricts lessair from flowing through the channel 818 to the chamber outlet 816. Inturn, the pressure in the chamber 814 decreases and the force of gravityacting on the air flow regulator 820 causes it to return to its first,or resting position. As with previous embodiments, this process repeatsitself as the user continues to exhale, effectively transmitting anoscillating back pressure to the user for the administration of OPEPtherapy.

The OPEP device 800, although being partially dependent upon theorientation of the OPEP device 800 for the administration of OPEPtherapy, is also selectively adjustable by a user. More specifically,the portion 819 of the channel 818 comprising a truncated cone has acentral axis offset from the central axis of the cylindrical channel. Assuch, when a user overcomes the force of friction between the channel818 and the housing 802 to rotate the channel 818, the user changes theangle of the channel 818 that contacts the air flow regulator 820, thenormal force supplied by the channel 818 against the air flow regulator820, and the direction of gravity relative thereto. As previouslyexplained, these variables affect the resistance of the air flowregulator 820 to the flow of exhaled air traveling through the channel818, and impact the amplitude and frequency of the OPEP therapyadministered to the user.

Turning now to FIGS. 47-49, a ninth embodiment of an OPEP device 900 isshown. In general, the OPEP device 900 comprises a housing 902, achamber 914, a chamber inlet 904, a chamber outlet 906, a channelassembly 916, and a mouthpiece 908. An exhalation flow path, identifiedby dotted line 911, is defined between the chamber inlet 904 and thechamber outlet 906.

Referring to FIG. 49, an exploded cross-sectional side view of thechannel assembly 916 of the OPEP device 900 is shown. The channelassembly 916 generally includes a channel 918, an air flow regulator920, a support ring 924, and a rotation ball 922 having a cylindricalbore 923. As with previous embodiments, a portion of the channel 918comprises a truncated cone in which the air flow regulator 920 ismaintained. Although not shown, an air flow regulator retaining membermay be affixed to the channel 918 to keep the air flow regulator 920within the confines of the channel 918. In this embodiment, the channel918 and the bore 923 of the rotation ball 922 also define the chamber914.

As shown in FIG. 48, the rotation ball 922 is fixedly attached to thehousing 902 such that the chamber inlet 904 is in fluid communicationwith the bore 923. A portion of the channel 918 is spherically shapedand sized so that it may be rotatably mounted about the rotation ball922 over the bore 923 via the support ring 924. The channel 918 and thesupport ring 924 may be connectable by any suitable means, such as bysnap or compression fit, as shown in FIG. 48. To aid in the creation ofa seal around the rotation ball 922, yet maintain mobility of thechannel 918 relative to the housing 902, the channel 918, the supportring 924, and the rotation ball 922 may be made of suitable low frictionmaterials (e.g., acetyl, nylon, etc.). Alternatively, a lubricant couldbe applied to the rotation ball 922 and the support ring 924. In thisway, a ball and socket joint is formed such that the channel 918 issupported by the rotation ball 922 and moveable within the housing 902about a center of rotation defined by the center of the rotation ball922. As in prior embodiments, a weight of the air flow regulator 920and/or a secondary weight biases the channel 918 in the direction ofgravity. Thus, as a user of the OPEP device 900 changes the orientationof the housing 902, a suitable orientation of the channel 918 relativeto the direction of gravity is maintained for the administration of OPEPtherapy.

The OPEP device 900 administers OPEP therapy in the same manner as thepreviously described embodiments. In general, as a user exhales into themouthpiece 908 through the chamber inlet 904, exhaled air flows alongthe exhalation flow path 911 through the bore 923 and into the chamber914. However, the weight of the air flow regulator 920, along with itssize and shape relative to the channel 918, restricts the volume ofexhaled air permitted to pass through the channel 918 and exit thechamber 914. As a result, the pressure in the chamber 914 duringexhalation increases, until the force acting on the portion of the airflow regulator 920 restricting the flow of air through the channel 918overcomes the force of gravity. At that point, the air flow regulator920 moves from its first, or resting position, as shown in FIG. 48, to asecond position, where less air is restricted from flowing through thechannel 918. In turn, the increase in the flow of exhaled air throughthe channel 918 causes the pressure in the chamber 914 to decrease. Asthe pressure decreases, the force of gravity acting on the air flowregulator 920 overcomes the force from the pressure in the chamber 914acting on the air flow regulator 920, and the air flow regulator 920returns to its first, or resting position. As a user continues toexhale, this process repeats itself, the pressure in the chamberoscillates, and OPEP therapy is administered to the user.

The foregoing description of the embodiments has been presented forpurposes of illustration and description, and is not intended to beexhaustive or to limit the inventions to the precise forms disclosed. Itwill be apparent to those skilled in the art that the present inventionsare susceptible of many variations and modifications coming within thescope of the following claims.

What is claimed is:
 1. A respiratory treatment device comprising: aninlet configured to receive air into the device; an outlet configured topermit air to exit the device; a channel positioned in a flow pathbetween the inlet and the outlet, the channel configured for movementrelative to a housing by a force of gravity in response to a change inan orientation of the housing; a weight movably attached to the channel,wherein a position of the weight relative to channel is selectivelyadjustable by a user; and, an air flow regulator moveable with respectto the channel between a first position where the flow of air throughthe channel is restricted, and a second position where the flow of airthrough the channel is less restricted, the air flow regulator beingconfigured to repeatedly move between the first position and the secondposition in response to a flow of air along the flow path.
 2. Therespiratory treatment device of claim 1, wherein selective adjustment ofthe position of the weight relative to the channel by the user moves thechannel relative to the housing.
 3. The respiratory treatment device ofclaim 1, wherein selective adjustment of the position of the weightrelative to the channel by the user moves the channel relative to theair flow regulator.
 4. The respiratory treatment device of claim 1,wherein the weight is configured for rotation about the channel.
 5. Therespiratory treatment device of claim 1, further comprising indiciarepresenting the position of the weight relative to the channel.
 6. Therespiratory treatment device of claim 1, further comprising indiciarepresenting the orientation of the channel relative to the housing. 7.The respiratory treatment device of claim 1, further comprising indiciarepresenting orientations of the housing suitable for providingrespiratory therapy.
 8. The respiratory treatment device of claim 1,wherein an orientation of the channel relative to the housing isselectively adjustable by a user independent of an orientation of thehousing.
 9. The respiratory treatment device of claim 1, wherein thechannel comprises a truncated cone.
 10. The respiratory treatment deviceof claim 1, wherein the air flow regulator comprises a sphere.
 11. Therespiratory treatment device of claim 1, wherein a weight of the airflow regulator offers a resistance to the flow of air through thechannel.
 12. A method of performing respiratory therapy, the methodcomprising: selectively adjusting a position of a weight attached to achannel moveable relative to a housing of a respiratory treatment devicein response to a change in an orientation of the housing; receiving aflow of air into the housing; directing the flow of air through thechannel; moving an air flow regulator with respect to the channelrepeatedly between a first position where the flow of air through thechannel is restricted, and a second position where the flow of airthrough the channel is less restricted.
 13. The method of claim 12,wherein selectively adjusting the position of the weight moves thechannel relative to the housing under a force of gravity.
 14. The methodof claim 12, wherein selectively adjusting the position of the weightmoves the channel relative to the air flow regulator.
 15. The method ofclaim 12, further comprising providing an indication representing theposition of the weight relative to the channel.
 16. The method of claim12, further comprising providing an indication representing theorientation of the channel relative to the housing.
 17. The method ofclaim 12, further comprising providing an indication representingorientations of the housing suitable for providing respiratory therapy.18. The method of claim 12, further comprising selectively adjusting anorientation of the channel relative to the housing.
 19. The method ofclaim 12, further comprising selectively adjusting an orientation of thechannel relative to the air flow regulator.
 20. A respiratory treatmentdevice comprising: an inlet configured to receive air into the device;an outlet configured to permit air to exit the device; a channelpositioned in a flow path between the inlet and the outlet, the channelconfigured for movement relative to the housing; a weight movablyattached to the channel; and, an air flow regulator moveable withrespect to the channel between a first position where the flow of airalong the flow path is restricted, and a second position where the flowof air along the flow path is less restricted, the air flow regulatorbeing configured to repeatedly move between the first position and thesecond position in response to a flow of air along the flow path;wherein an orientation of the channel relative to the housing isselectively adjustable by a user.